Ukraine's Alexandr Dolgopolov pulls out of Kooyong exhibition final with leg injury

Petra Kvitova of the Czech Republic reacts after she won a break point in her match against Tsvetana Pironkova of Bulgaria at the Sydney International Tennis tournament in Sydney, Australia Thursday, Jan. 15, 2015. (AP Photo/Rob Griffith) (The Associated Press)

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Petra Kvitova of the Czech Republic plays a shot in the women's final match against compatriot Karolina Pliskova at the Sydney International Tennis tournament in Sydney, Friday, Jan. 16, 2015. (AP Photo/Rob Griffith) (The Associated Press)